You walk through the valley of the shadow of death, and make lots of friends there.
Subclass Features
Level 2
- Necromancy Savant: Halves the cost to learn Necromancy spells from Scrolls. Learning these spells will only cost
25gpper spell level. 
Grim Harvest: Once per turn, if you kill a creature with a spell, you regain Hit Points equal to twice the Spell SLot level used - thrice if it's a Necromancy spell. Undead and Constructs are unaffected.
Level 6
Undead Thralls: Animate Dead: You gain the Animate Dead spell, if you didn't have it already.
Undead Thralls: Additional Undead: When you use Animate Dead, you can raise an additional corpse.
Undead Thralls: Better Summons: Creatures created with Animate Dead have additional hit points equal to your Wizard level, and your Proficiency Bonus is added to their damage.
Level 10
Injured to Undeath: You have steeped youself so completely in death that you are Resistant to Necrotic damage, and your hit point maximum cannot be reduced.
